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#include <uwsgi.h>
#include <matheval.h>
static char *uwsgi_route_var_math(struct wsgi_request *wsgi_req, char *key, uint16_t keylen, uint16_t *vallen) {
char *ret = NULL;
// avoid crash
if (!wsgi_req->var_cnt) return NULL;
// we make a bit of fun here, we do a copy of the vars buffer (+1 byte for final zero) and zeor-pad all of the strings
char *vars_buf = uwsgi_malloc(wsgi_req->uh->pktsize + keylen + 1);
char **names = uwsgi_malloc(sizeof(char *) * (wsgi_req->var_cnt/2));
double *values = uwsgi_calloc(sizeof(double) * (wsgi_req->var_cnt/2));
int i,j = 0;
char *ptr = vars_buf;
for (i = wsgi_req->var_cnt-1; i > 0; i -= 2) {
memcpy(ptr, wsgi_req->hvec[i-1].iov_base, wsgi_req->hvec[i-1].iov_len);
names[j] = ptr;
ptr += wsgi_req->hvec[i-1].iov_len;
*ptr++=0;
char *num = ptr;
memcpy(ptr, wsgi_req->hvec[i].iov_base, wsgi_req->hvec[i].iov_len);
ptr += wsgi_req->hvec[i].iov_len;
*ptr++=0;
values[j] = strtod(num, NULL);
j++;
}
char *expr = ptr;
memcpy(ptr, key, keylen); ptr += keylen;
*ptr++=0;
void *e = evaluator_create(expr);
if (!e) goto end;
double n = evaluator_evaluate(e, j, names, values);
evaluator_destroy(e);
ret = uwsgi_num2str((int)n);
*vallen = strlen(ret);
end:
free(vars_buf);
free(names);
free(values);
return ret;
}
static void router_matheval_register() {
struct uwsgi_route_var *urv = uwsgi_register_route_var("math", uwsgi_route_var_math);
urv->need_free = 1;
}
struct uwsgi_plugin matheval_plugin = {
.name = "matheval",
.on_load = router_matheval_register,
};
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